package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 分类分页查询
     *
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(categoryPageQueryDTO.getPage(), categoryPageQueryDTO.getPageSize());

        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);

        long total = page.getTotal();   //获取员工总数
        List<Category> result = page.getResult();   //获取分页查询结果

        return new PageResult(total, result);
    }

    /**
     * 启用禁用分类
     *
     * @param status
     * @param id
     * @return
     */
    public void startOrStop(Integer status, Long id) {
        //创建一个category类来封装请求参数
        Category category = Category.builder()
                .id(id)
                .status(status)
//                .updateUser(BaseContext.getCurrentId())        //设置当前记录修改人的id
//                .updateTime(LocalDateTime.now())         //更新修改时间
                .build();

        categoryMapper.update(category);
    }

    /**
     * 修改分类
     *
     * @param categoryDTO
     * @return
     */
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO, category);    //将categoryDTO对应值拷贝到category

//        //更新修改时间
//        category.setUpdateTime(LocalDateTime.now());
//        //设置当前记录修改人的id
//        category.setUpdateUser(BaseContext.getCurrentId());

        categoryMapper.update(category);
    }

    /**
     * 根据id删除分类
     *
     * @param id
     * @return
     */
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
        Integer count = dishMapper.countByCategoryId(id);
        if (count > 0){
            //当前分类下有菜品, 不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
        count = setmealMapper.countByCategoryId(id);
        if (count > 0){
            //当前分类下有套餐, 不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
    }

    /**
     * 新增分类
     *
     * @param categoryDTO
     * @return
     */
    public void save(CategoryDTO categoryDTO) {
        //创建category封装新增属性
        Category category = Category.builder()
//                .createTime(LocalDateTime.now())
//                .updateTime(LocalDateTime.now())
//                .createUser(BaseContext.getCurrentId())
//                .updateUser(BaseContext.getCurrentId())
                .status(StatusConstant.DISABLE)     //新增分类默认为禁用
                .build();

        BeanUtils.copyProperties(categoryDTO, category);    //将categoryDTO对应值拷贝到category

        categoryMapper.insert(category);
    }

    /**
     * 根据类型查询分类
     *
     * @param type
     * @return
     */
    public List<Category> getByType(Integer type) {
        return categoryMapper.getByType(type);
    }

    /**
     * 查询所有分类
     * @return
     */
    public List<Category> selectAllCategory() {
        return categoryMapper.selectAllCategory();
    }
}
